text: The South Pole-Aitken Terrane, or SPAT, may simply represent deep crustal materials of the Feldspathic Highlands Terrane.  It has thorium levels between those of the PKT and FHT.  The SPAT can be divided into two terranes, an outer and an inner SPAT.  The outer SPAT has less iron oxide and thorium than its inner counterpart, although the thorium levels are still between those of the PKT and FHT.  The terrane has its origins in a large impact that occurred early in the Moons history and which had a major impact on the Moons thermal evolution.
  The inner and outer SPAT cover 5.3% and 5.7% of the lunar surface, respectively.  Despite collectively covering 11% of the surface, SPAT contains only 5.8% of the thorium in the lunar crust.
  The SPAT lies exclusively in the far side of the moon, and contains the South Pole-Aitken basin.  Chang'e 4, the first and only far-side lander, has landed in the region.  It is not a sample return mission, and thus no samples have been directly taken from this terrane yet.